Axle-hung box steel casting for diesel locomotive

Abstract

The utility model discloses an axle suspension box steel casting for an internal combustion locomotive, which comprises an outer mold, a pouring gate mold and an outer chilling block, semi-ring molds are arranged at the left end and the right end of the outer mold, a downsprue positioning plate is arranged on the surface of the outer mold, an accessory mold is arranged on the surface of the outer mold, an inner chilling block is arranged in the accessory mold, the pouring gate mold is arc-shaped, and the pouring gate mold is attached to the outer mold. A third loam core is arranged between the pouring gate mold and the outer mold, the multiple outer chilling blocks are annularly arranged on the surface of the semi-ring mold, and through the outer mold, the pouring gate mold and the third loam core, the size and the smooth and clean surface quality of the axle suspension box can be effectively guaranteed, and the hot crack phenomenon generated when molten metal solidifies and shrinks is effectively reduced; through the direct pouring gate positioning plate and the pouring gate mold, rapid mold filling of molten metal can be guaranteed, the good feeding effect is achieved, shrinkage cavities and shrinkage porosity can be effectively prevented, the internal structure of the axle suspension box is compact, the defects of sand inclusion, air holes and the like in the axle suspension box are few, and the production quality of the axle suspension box is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of axle-holding boxes, in particular to an axle-holding box steel casting for an internal combustion locomotive. Background Art

[0002] The main purpose of the axle box is to serve as an important supporting and fixing component of the axle box of a diesel locomotive. Since the load-bearing capacity of the axle box is relatively large, in order to improve the strength of the axle box, a cast steel mold is used in combination with medium-carbon quenched and tempered steel material to manufacture an one-piece axle box.

[0003] At present, when casting castings with high dimensional accuracy requirements such as axle boxes, although the steel casting mold can obtain a higher dimensional accuracy level, due to the poor yield of the steel casting mold, when the molten steel solidifies and shrinks, thermal cracks are easily generated due to the uneven wall thickness of the casting, resulting in a low qualified rate of the casting. In addition, the axle box needs to bear a certain load, so the axle box needs to have a good density and meet the requirements of the radiographic flaw detection level. However, using conventional casting methods, the axle box will have defects such as shrinkage, pores and sand inclusions, which will be exposed after processing, making the qualified rate of the axle box low and increasing the production cost. Utility Model Content

[0004] The utility model aims to provide an axle box casting for a diesel locomotive to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the utility model provides the following technical solutions: a steel casting for an axle box for a diesel locomotive, comprising an outer mold, half ring molds are provided at the left and right ends of the outer mold, a sprue positioning plate is provided on the surface of the outer mold, an accessory mold is provided on the surface of the outer mold, and an inner chiller is provided inside the accessory mold;

[0006] The runner mold is arranged in an arc shape, the runner mold is fitted with the outer mold, and a third mud core is arranged between the runner mold and the outer mold. When the axle box is produced, the third mud core can support and position the axle box, realize the adjustment of the interior of the axle box and the optimization of the structure, improve the accuracy and surface quality of the axle box, and reduce shrinkage holes and pores in the solidification process;

[0007] External chillers, wherein a plurality of external chillers are provided and arranged in a ring shape on the surface of the semi-ring mold, the high thermal conductivity of the external chillers and the internal chillers can effectively accelerate the metal solidification process and improve the quality of the axle box.

[0008] Furthermore, the outer mold surface and the two side surfaces of the accessory mold are respectively provided with a first mud core and a second mud core, the first mud core and the second mud core can improve the precision of the accessory mold in shaping the axle box, and cooperate with the internal cooling iron to improve the yield rate of the axle box.

[0009] Furthermore, the outer mold surface is provided with a plurality of insulation risers, which have the advantages of good insulation performance, high refractoriness, strong shrinkage compensation ability, small re-firing line shrinkage, and easy use, so that the metal melt for manufacturing the axle box has a long solidification time and a good shrinkage compensation effect.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] (1) Through the outer mold, the runner mold and the third mud core, the size and smooth surface quality of the axle box can be effectively guaranteed, and the thermal crack phenomenon caused by the solidification and shrinkage of the molten metal can be effectively reduced.

[0012] (2) By arranging an outer chiller on the semi-ring mold, an inner chiller in the accessory mold, and a plurality of heat-insulating risers on the surface of the outer mold, the overall density of the axle box and the exhaust and slag removal can be effectively guaranteed by combining the outer chiller, the inner chiller, and the heat-insulating risers.

[0013] (3) The sprue positioning plate and runner mold can ensure that the molten metal can be quickly filled into the mold and achieve a good shrinkage compensation effect, which can effectively prevent the occurrence of shrinkage cavities and shrinkage. The internal structure of the axle box is dense, and there are fewer defects such as sand inclusions and pores inside the axle box, thereby improving the quality of the axle box production. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of the outer mold of the utility model;

[0015] Figure 2 For this utility model Figure 1 Sectional view at AA in the middle;

[0016] Figure 3 For this utility model Figure 1 Sectional view at the middle BB;

[0017] Figure 4 It is a side sectional view of the outer mold of the utility model;

[0018] Figure 5 This is a schematic diagram of the structure of the positioning connection between the outer mold and the sprue of the utility model;

[0019] Figure 6 It is a structural schematic diagram of the runner mold of the utility model.

[0020] In the figure: 1. outer mold; 2. semi-ring mold; 3. second mud core; 4. first mud core; 5. third mud core; 6. accessory mold; 7. outer chiller; 8. runner mold; 9. mounting seat; 10. insulation riser; 11. sprue positioning plate; 12. inner chiller. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Example:

[0023] See also Figure 1-6 The utility model provides a technical solution: a steel casting for an axle box for a diesel locomotive, comprising an outer mold 1, a semi-ring mold 2 is provided at the left and right ends of the outer mold 1, a sprue positioning plate 11 is provided on the surface of the outer mold 1, an accessory mold 6 is provided on the surface of the outer mold 1, and an inner chiller 12 is provided inside the accessory mold 6;

[0024] A runner mold 8, wherein the runner mold 8 is arranged in an arc shape, the runner mold 8 is fitted with the outer mold 1, and a third mud core 5 is arranged between the runner mold 8 and the outer mold 1;

[0025] The semi-ring mold 2 is integrally formed with the outer mold 1, and the two ends of the runner mold 8 have structures corresponding to the semi-ring mold 2, which can ensure that the runner mold 8 and the outer mold 1 are closely fitted, and the two ends of the third mud core 5 extend from the runner mold 8 and the outer mold 1, ensuring that the ends of the produced axle box will not have defects;

[0026] The outer chiller 7 is provided in a plurality and arranged in a ring shape on the surface of the semi-ring mold 2 to evenly conduct heat to the semi-ring mold 2, accelerate the solidification of the molten metal, and improve the quality of the axle box.

[0027] In this embodiment, if Figure 1 and Figure 4 As shown, the surface of the outer mold 1 and the two side surfaces of the accessory mold 6 are respectively provided with a first mud core 4 and a second mud core 3, and the first mud core 4 and the second mud core 3 cooperate to support and position a part of the axle box to ensure that there will be no large work error in this part of the axle box, thereby avoiding the problem of reduced quality of the entire axle box due to the local part of the axle box.

[0028] In this embodiment, if Figure 5 As shown, the surface of the outer mold 1 is provided with a plurality of insulation risers 10, nine insulation risers 10 are arranged and distributed on the surface of the outer mold 1. The use of the insulation risers 10 can extend the cooling time of the molten metal, enhance the shrinkage compensation effect, save the cost of metal melting and cutting risers, and reduce the production cost of the axle box.

[0029] In this embodiment, if Figure 2 and Figure 3As shown, a mounting seat 9 is provided on the surface of the runner mold 8, which is convenient for moving the runner mold 8 so that the runner mold 8 and the outer mold 1 are molded together, and it is also convenient for demoulding the axle box.

[0030] Specifically, when in use, the third mud core 5 is placed in the outer mold 1, the first mud core 4 and the second mud core 3 are placed on the surface of the outer mold 1, the outer chiller 7 is installed on the semi-ring mold 2, the inner chiller 12 is placed inside the accessory mold 6, the runner mold 8 is fitted with the outer mold 1, the runner is installed on the sprue positioning plate 11, and the molten metal is fed into the outer mold 1 and the runner mold 8 through the runner. The third mud core 5 supports and positions the molten metal, and the molten metal is solidified by the inner chiller 12 and the outer chiller 7. The pouring temperature of the molten metal is 1550-1570°C, and the solidification time of the molten metal is more than eight hours to form an axle holding box, and then the outer mold 1 and the runner mold 8 are separated, and the axle holding box can be taken out.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steel casting for an axle box for a diesel locomotive, characterized in that: include: An outer mold (1), wherein the left and right ends of the outer mold (1) are provided with semi-ring molds (2), the surface of the outer mold (1) is provided with a sprue positioning plate (11), the surface of the outer mold (1) is provided with an accessory mold (6), and the interior of the accessory mold (6) is provided with an inner chiller (12); A runner mold (8), wherein the runner mold (8) is arranged in an arc shape, the runner mold (8) is fitted with the outer mold (1), and a third mud core (5) is arranged between the runner mold (8) and the outer mold (1); External cooling irons (7), wherein a plurality of external cooling irons (7) are provided, and the plurality of external cooling irons (7) are arranged in a ring shape on the surface of the semi-ring mold (2).

2. The axle box steel casting for a diesel locomotive according to claim 1, characterized in that: A first mud core (4) and a second mud core (3) are respectively provided on the surface of the outer mold (1) and on the two side surfaces of the accessory mold (6).

3. The axle box steel casting for a diesel locomotive according to claim 1, characterized in that: The surface of the outer mold (1) is provided with a plurality of heat-insulating risers (10).

4. The axle box steel casting for a diesel locomotive according to claim 1, characterized in that: A mounting seat (9) is provided on the surface of the runner mold (8).

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